Try this example,

<apex:page sidebar="false" controller="ContactController"> 
    
 
    <p/>
    
    <apex:pageMessages />
    <apex:form >    
    
    <apex:actionFunction name="saveEdit" action="{!saveEdit}"/>
        
    <apex:pageBlock >
    <apex:outputPanel id="employeeList">
    <table>
        <tr>
            <th style="width:40px"> </th>
            <th style="width:40px"> </th>
            <th style="width:90px">Last Name</th>
            <th style="width:90px">Email</th>
            <th>Employee ID</th>
        </tr>
        <apex:repeat value="{!employees}" var="e">
        <tr style="height:20px">
            <apex:outputPanel id="editRow" layout="none" rendered="{!e.Id == editContact.Id}">
                <td><apex:commandLink action="{!cancelEdit}" rerender="employeeList">Cancel</apex:commandLink></td>
                <td><apex:commandLink action="{!saveEdit}" rerender="employeeList">Save</apex:commandLink></td>
                <td><apex:inputField rendered="{!e.Id == editContact.Id}" value="{!editContact.LastName}"/></td>
                <td><apex:inputField rendered="{!e.Id == editContact.Id}" value="{!editContact.email}"/></td>
             <td><apex:inputField rendered="{!e.Id == editContact.Id}" onkeypress="if (event.keyCode == 13) saveEdit()" value="{!editContact.Employee__c}"/></td>
            </apex:outputPanel>
            <apex:outputPanel id="viewRow" layout="none" rendered="{!e.Id != editContact.Id}">
                <td>
                    <apex:commandLink action="{!del}" onclick="return confirm('Are you sure you want to delete this Employee?')">Del
                        <apex:param name="delid" value="{!e.Id}"/>
                    </apex:commandLink>
                    
                </td>
                <td>
                    <apex:commandLink action="{!editcon}" rerender="employeeList">Edit <apex:param name="editid" value="{!e.id}"/>
                    </apex:commandLink>
                </td>
                <td>{!e.LastName}</td>
                <td>{!e.email}</td>
                <td>{!e.Employee__c}</td>
            </apex:outputPanel>
        </tr>
        </apex:repeat>
    </table>
    </apex:outputPanel>
    </apex:pageBlock>

    </apex:form>
    
</apex:page>

public class ContactController {

    public ContactController(ApexPages.StandardController controller) {
    
        

    }
String theId = ApexPages.currentPage().getParameters().get('id');


   public Contact newEmployee { get; set; }
    
    public Contact editContact { get; set; }

    public ContactController () {
        newEmployee = new Contact();
    }
    
    public Contact[] getEmployees() {
    System.Debug('NAME ::: '+theId);
       
        return [Select c.LastName, c.Id, c.Employee__c, c.Email, (Select Id, Name From Employees__r) From Contact c WHERE Employee__c=:ApexPages.currentPage().getParameters().get('id')];
    }
    
    public String getParam(String name) {
        return ApexPages.currentPage().getParameters().get(name);   
    }
    
    public PageReference add() {
        try {
            INSERT newEmployee;
            newEmployee = new Contact();
        } catch (Exception e) {
            ApexPages.addMessages(e);
        }
        return null;
    }
     
    public PageReference del() {
        try {
            String delid = getParam('delid');
            Contact employee = [SELECT Id FROM Contact WHERE ID=:delid];
            DELETE employee;
        } catch (Exception e) {
            ApexPages.addMessages(e);
        }
        return null;
    }
    
    public PageReference editcon() {
        String editid = getParam('editid');
        editContact = [SELECT Name, LastName, email,Employee__c FROM Contact WHERE id=:editid];
        return null;
    }
    
    public PageReference cancelEdit() {
   // System.Debug('GETURL ::: '+ApexPages.currentPage().getUrl());
        editContact = null;
        return null;
    }
    
    public PageReference saveEdit() {
        try {
            UPDATE editContact;
            editContact = null;
        } catch (Exception e) {
            ApexPages.addMessages(e);
        }
        return null;
    }

}

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